Harklinikken US | Natural Products & Care for Hair Growth – Hårklinikken US

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The Hair Gain Extract

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HXC-4 Hair Extract Serum Has Finally Arrived

Our most anticipated formula for thicker, denser, healthier hair is here.

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“No two scalps or heads of hair are the same. Therefore, each Extract is continually adapted to your unique biology.”

LARS SKJØTH

HÅRKLINIKKEN FOUNDER & LEAD RESEARCHER

Strong, Healthy Hair Begins With Your Scalp

Ready to find out if our award-winning products could work for you?

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Hair Supplement

Over 10 years in the making, our Hair Supplement is designed to support hair health, strength and density from within by addressing the internal triggers of hair loss and thinning through a combination of science-backed vitamins, minerals and nutrients.

Drug-Free

Clinically Proven Ingredients

Responsible Biotin Formulation

Supports Hormone Balance

Enhances Gut Health & Nutrient Digestion

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The Hårklinikken Method

Embark on a journey to a healthier scalp and thicker, stronger hair with our multi-step, drug-free, fully customisable regimen.

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Experience The Power Of Personalisation

Hårklinikken’s team of hair specialists formulate every bottle of Extract to meet

your unique requirements.

Healthier Scalp

Nourished and comfortable

Balanced Microbiome

Crucial for healthy hair growth

Naturally-Derived

Premium botanical extracts

Hair Strength

Stronger, less prone to breakage

Hair Growth

Active, healthy growth

Fortified Scalp

Less hair thinning and breakage

Tried & Tested

97%

agreed their hairline looked fuller and hair appeared healthier.*

100%

perceived an improvement in hair health and an increase in scalp coverage*

94%

agreed their hair felt thicker and was growing faster*

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*120-day third-party consumer study of 36 people using Hair Gain Extract & Stabilizing Scalp Shampoo

Clinically-Studied Results

Though our Hair Gain Extract has been shown to deliver results across 100,000+ clients over the past 33 years, we wanted to confirm its efficacy in a controlled third-party clinical study. Our 2024 findings offer some of the most compelling evidence for what a scalp-first, drug-free approach to hair and scalp health can achieve.

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Trusted by experts

“My hairline looks denser, and I couldn’t be more pleased”

– Rikke, Hair Specialist

Female, 20s, 29 Months on Extract

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What Our Customers Say

Rated 4.47 out of 5, based on 3301 reviews

Reduced Itching

‘The Extract has reduced my itching scalp and reduced hair loss. My hair's thicker than it’s been in years.’

Fuller Hair

‘I’ve been using Hårklinikken Extract for about 4 months. My hair looks and feels fuller.’

Thick and long

‘I’ve regularly used Hårklinikken products for several years and the results are incredible.’

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Visit Our Clinics

Book an in-person consultation with a Hair Specialist at our Los Angeles or NYC clinics.

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Our Scientific Board of Advisors

Meet the experts behind our work who dedicate their efforts to our product research, development, safety, and efficacy.

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Journal

Does Caffeine Grow Hair?

July 15, 2026

The Conversation Nobody Had with Us: Hair, Identity, and Menopause

June 8, 2026

PCOS is Now PMOS: What the Name Means for Hair Loss

May 15, 2026

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